Bài 3: Tìm x: a) 1 - |x - 1/2 -1/3|= 1/4 b) x+5/4 = x-3/5 Bài 4: Cho B = 12/(2.4) mũ 2+20/(4.6) mũ 2 + ... + 388/(96.98) mũ 2 + 396/ (98.100) mũ 2 . Hãy so sánh B với 1/4. # Làm nhanh,đúng và chi tiết giúp mình nha! # Cảm ơn dẫ giúp đỡ!

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